Backup Domain Controller

Hi there, can anyone point me to a document or tell me how to setup a backup domain controller on a Windows 2003 server so if my main controller goes offline the backup one will carry on working the network. Basically an exact replication of the main server like mirroring?
grovenetsupportAsked:
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Jay_Jay70Commented:
DFS or clustering? clustering is monstrous overkill and extremely expensive
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Jay_Jay70Commented:
Hi grovenetsupport,

1) Promote your new machine as an additional domain controller in an already existing domain - this will allow AD to replicate to the new server
2) Make sure DNS is AD integrated on your old DC to allow all DNS replications also
3) Run DCDIAG to make sure all is well and replication is fine

thats about it my friend   simple as
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grovenetsupportAuthor Commented:
Thanks for this. I have a server doing this already in the AD its our exchange server but what about files etc not just the logons?
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Jay_Jay70Commented:
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dooleydogCommented:
It is expensive, but have you considered clustering? very fault tolerant and usually, no unexpected down time.

Just a thought,

Good Luck,

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grovenetsupportAuthor Commented:
Thanks are there any documents relating equipment and setting up of this?
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ryanmnlyCommented:
When promotiing the second server to backup controller, is it necessary to add it to the AD as a regular computer then run dcpromo? Or can I just add it as a backup controller right from the beginning?
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